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Ultrason Sonochem. 2014 Jul;21(4):1335-42. doi: 10.1016/j.ultsonch.2014.02.007. Epub 2014 Feb 18.

Synthesis of morphology-controlled ZnO microstructures via a microwave-assisted hydrothermal method and their gas-sensing property.

Author information

1
School of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, PR China.
2
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China.
3
Graduated School at Shenzhen, Tsinghua University, Shenzhen 518055, PR China.
4
Shenzhen Dovelet Sensors Technology Co., Ltd., Shenzhen 518057, PR China.
5
School of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, PR China. Electronic address: pxzhang@szu.edu.cn.

Abstract

Controllable ZnO architectures with flower-like and rod-like morphologies were synthesized via a microwave-assisted hydrothermal method. By adjusting the concentration of Zn(2+) in the aqueous precursors, different morphologies of ZnO microstructures were obtained. The size of ZnO was uniform after ultrasonic treatment. The growth process of ZnO in solution was studied by monitoring the intermediate products, which were extracted at different stages of the reactions: (i) precursor preparation, (ii) microwave irradiation heating, (iii) natural cooling. Studies of the SEM images and XRD data revealed that the formation of ZnO occurred via in situ assembly or dissolution-reprecipitation of zinc hydroxide complexes. The morphology-dependent ethanol sensing performance was observed; the seven-spine ZnO structures exhibit the highest activity.

KEYWORDS:

Ethanol; Gas sensors; Hydrothermal; Microwave; ZnO

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